Why would we give up the guy the might be our starter in 3 weeks after the team goes 3-5

I certainly hope the Team and Tanehill can get out of this slump and the coaches aren't scratching their heads about whether to bench him. What's a more likely scenario is Tanehill gets hurt and Moore comes in. I really don't see Moore getting traded, especially for a good O-Lineman...........that's like throwing the baby out with the bathwater........bringing in a backup QB to play with a depleted O-line.